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A theoretical model to numerically study the local space-charge field induced by light in a photorefractive crystal biased with two independent, perpendicularly oriented external static fields is introduced. This model appears attractive because it allows varying, in the crystal transverse plane, of the orientation of the external biasing static field with respect to that of the optical-field vector, then enhancing the tensorial properties of the crystal. The numerical analysis has revealed that, in a nonconventional biasing configuration, the spatial distributions of the space-charge-field vector transversal components exhibit a further anisotropy that has not been shown up to now. Nevertheless, from a practical point of view, such a boundary configuration could allow better management of the focusing characteristics of the material.


Index Terms—Nonlinear optics, nonlinear wave propagation, optical self-focusing, optical solitons, photorefractive effects, photorefractive materials.

 

 

 

 

Figure 1. Photorefractive beam fanning, a self-action nonlinear optical effect.



A complete source code to calculate photorefractive space-charge field with conventional and unconventional biasing schemes. For more information:

Journal of Lightwave Technology, Vol. 23, No. 6, pp. 2175-2185, June 2005

Claudio Crognale and Luigi Rosa, “Vector Analysis of the Space-
Charge Field in Nonconventionally Biased Photorefractive Crystals”
, Journal of Lightwave Technology, Vol. 23, No. 6, pp. 2175-2185, June 2005.

Claudio Crognale and Luigi Rosa, “Non-conventional biasing scheme for re-configurable bulk optical beam polarization converters based on centrosymmetric photorefractive crystals”, U.S. Patent, pending.


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The authors have no relationship or partnership with The Mathworks. All the code provided is written in Matlab language (M-files and/or M-functions), with no dll or other protected parts of code (P-files or executables). The code was developed with Matlab 14 SP1. The code provided has to be considered "as is" and it is without any kind of warranty. The authors deny any kind of warranty concerning the code as well as any kind of responsibility for problems and damages which may be caused by the use of the code itself including all parts of the source code.

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